Security forces have reportedly intervened in an effort to end the clashes.

According to eyewitnesses cited by Reuters, gunshots were heard in the area and police were seen firing tear gas.

The deaths come one day after the Egyptian military issued a warning that Morsi had 48 hours to "meet the demands of the people" or they would take control. Morsi has remained defiant despite the threat, taking to state television to call for respect for his "constitutional legitimacy."

Egypt's military has drawn up a plan to suspend the Islamist-backed constitution, dissolve the Islamist-dominated legislature and set up an interim administration headed by the country's chief justice if Morsi fails to reach a solution with his opponents by the end of a Wednesday deadline, Egypt's state news agency reported.